PEDT导电聚合物气敏特性研究

Study on Conducting Polymer PEDT Used as a Gas Sensor Material

采用化学聚合法制备了导电聚合物3,4-乙烯二氧噻吩膜,利用扫描电子显微镜和傅里叶变换红外光谱法对薄膜的光学成分及形貌进行了分析。采用叉指电极结构研制出了3,4-乙烯二氧噻吩薄膜气体传感器,研究了3,4-乙烯二氧噻吩薄膜气体传感器对有毒气体NO2和NH3的敏感特性以及其自身的温度特性。结果发现,3,4-乙烯二氧噻吩薄膜气体传感器对低浓度的NO2和NH3都具有很好的敏感特性。该文还对3,4-乙烯二氧噻吩薄膜对NO2和NH3两种气体的敏感机理进行了详细的讨论。

The conducting polymer Poly 3,4-Ethylene Dioxy Thiophene （PEDT） thin films was prepared by chemical polymerization. Fourier transform infrared and Scanning Electron Microscope （SEM） were used to characterize its optical property and morphology. A gas sensor using PEDT thin film was fabricated with the assistance of interdigitated electrodes. The sensitivities of the prepared sensor to toxic NO2 and NH3 and its temperature property were studied. Results show that PEDT thin film sensor is very sensitive to NO2 and NH3 of low concentrations. And the sensitive mechanisms of PEDT thin film to toxic gases NO2 and NH3 were also discussed in detail in the paper.